28079906 has 4 divisors (see below), whose sum is σ = 42119862. Its totient is φ = 14039952.

The previous prime is 28079899. The next prime is 28079923. The reversal of 28079906 is 60997082.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 22515025 + 5564881 = 4745^2 + 2359^2 .

It is a super-2 number, since 2×28079906² = 1576962241937672, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7019975 + ... + 7019978.

Almost surely, 2^28079906 is an apocalyptic number.

28079906 is a deficient number, since it is larger than the sum of its proper divisors (14039956).

28079906 is a wasteful number, since it uses less digits than its factorization.

28079906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14039955.

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 28079906 is about 5299.0476502859. The cubic root of 28079906 is about 303.9474819826.

The spelling of 28079906 in words is "twenty-eight million, seventy-nine thousand, nine hundred six".